Update LLM app descriptions and workflow in Docs

[mmabrouk]

This pull request updates the descriptions and workflow of the LLM app. It includes changes to the app architecture, retrieval augment generation architecture, and the difference between AI applications and traditional software. These updates provide a clearer understanding of how to build robust LLM applications.

Update advanced tutorial link in getting-started-code.mdx

This pull request updates the link to the advanced tutorial in the getting-started-code.mdx file. The new link directs users to the correct tutorial for creating an LLM app from scratch.

Update colors in mint.json

This pull request updates the colors in the mint.json file. The new colors provide a more visually appealing and cohesive design for the application.

Update getting started UI guide

This pull request updates the UI guide for getting started with the application. The new guide provides step-by-step instructions on how to install and set up the application, making it easier for users to get started.

Add code for using a custom LLM in Agenta

This pull request adds code for using a custom LLM in Agenta. The new code allows users to integrate their own LLM models into the application, expanding the range of possibilities for AI experimentation.

Add custom LLM usage guide

This pull request adds a usage guide for custom LLMs in Agenta. The guide provides detailed instructions on how to use custom LLMs, including configuration and parameter settings.

Remove unnecessary content and update support links

This pull request removes unnecessary content and updates support links in the application. The removal of unnecessary content streamlines the application's interface, while the updated support links provide users with the most up-to-date resources for assistance.

Delete SDK documentation file

This pull request deletes an outdated SDK documentation file. The removal of this file ensures that users have access to the most accurate and relevant documentation.

Add documentation for config object and its methods

This pull request adds documentation for the config object and its methods. The new documentation provides a comprehensive overview of the config object and how to use its methods to access and manipulate configuration parameters.

Update links and group names in mint.json